Wardley maps help to plot key activities andresources contributing to a certain value chain, from the perspective of their visibility (appreci-ation from the end user) and state of evolution, from the Genesis (something gets invented forthe first time), to the gradual diffusion into the industry (from being custom built to becomingcompeting products, then services and ultimately commodities and ubiquitous utilities).

By contrast, when we’re working on a large work-in-progress manuscript, we’re juggling many ideas in various states of completion. Different parts of the document are at different levels of fidelity. The document is large enough that it’s easy to lose one’s place or to forget where other relevant points are when one returns. Starting and stopping work for the day feel like heavy tasks, drawing heavily on working memory.